Duckweed index for my low tech.

Sarpijk

Member
Joined
11 Jan 2015
Messages
425
Hi all, I setup my 100 litre last July using dirt. I believe that by now it may have been depleted this is why I am looking into some insight in terms of dosing. This is low tech so I thought I give @dw1305 Darrel's Duckweed index a try. It is a tank filled with Cryptocoryne so any deficiencies should take a while before they show.

I do use Osmocote balls in the substrate every few months and I dose 1/3 EI but not every week.

For reference I give a picture of the Limnobium growing in my tank and also of the Ceratopteris.

If I look at the Limnobium I conclude that sth is missing and I should dose. On the other hand a week ago I took this sole portion of Ceratopteris Thalictroides and wedged it behind the spraybar so that it stays fixed. Today I took this pic and it seems great.

So am I to believe that this being a high flow tank doesn't benefit the Limnobium? I have a fair amount of surface agitation and although the Limnobium is not freely traveling around the tank it still doesn't take off.
ae72ae0f85f2f69176849ad181e10ee2.jpg
 

dw1305

Expert
Joined
7 Apr 2008
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9,756
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nr Bath
Hi all,
If I look at the Limnobium I conclude that sth is missing and I should dose.
It looks OK in terms of not obviously nutrient deficient, but possibly on "low rations". You could try upping the amount of EI fertiliser you add. I might go for more frequent dosing.

Do you measure the electrical conductivity?

cheers Darrel
 

Sarpijk

Member
Joined
11 Jan 2015
Messages
425
After a 50% water change a few hours ago TDS is 227 ppm. It gets over 300 by the end of the week.
 
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